fix(sh): eagerly load sh-script mode when opening a REPL

This is to bring the `sh-shell` variable in scope, when it otherwise
would not be if a `Sh` buffer hadn't yet been opened in the current
Emacs session.

modules/lang/sh/autoload.el

@@ -30,6 +30,7 @@
 (defun +sh/open-repl ()
   "Open a shell REPL."
   (interactive)
+  (require 'sh-script)
   (let* ((dest-sh (symbol-name sh-shell))
          (sh-shell-file dest-sh))
     (sh-shell-process t)